A CAPTCHA appears when the python: code accesses the weixin.sogou.com, but not when the browser is opened

write a program to grab weixin.sogou.com data, and CAPTCHA appears from time to time.
however, when I open weixin.sogou.com using a browser, there is no CAPTCHA.
doesn"t Sogou judge by IP?
Code:

def __weixin_search(self, keyword, cur_page, start_date, end_date, timeout=30):
        html = None
        while True:
            try:
                if self.__cookie is None:
                    self.__set_cookie(timeout=timeout)
                if isinstance(keyword, types.UnicodeType):
                    keyword = keyword.encode("utf-8")
                url = "http://weixin.sogou.com/weixin?type=2&s_from=input&ie=utf8&_sug_=n&_sug_type_=&query="
                url += urllib2.quote(keyword)
                headers = {
                    "User-Agent": random.choice(USER_AGENTS),-sharp 
                    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
                    "Accept-Language": "zh-CN,zh;q=0.8",
                    "Accept-Encoding": "gzip, deflate, sdch",
                    "DNT": "1",
                    "Connection": "keep-alive",
                    "Cookie": self.__cookie
                }
                r = requests.get(url=url, headers=headers, timeout=timeout)
                html = r.text.encode("ISO-8859-1")
                if html is None or html.find(u"seccodeInput") is not -1:
                    -sharp IP
                    self.__cookie = None
                    time.sleep(1)
                else:
                    t = HTMLParser.HTMLParser()
                    return t.unescape(html)
            except Exception as ex:
                -sharpprint_msg(msg=traceback.format_exc(), save_to_log=True)
                pass
Mar.18,2021

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